/**
 * cookie封装，当仅传入名称时，获取cookie；当传入名称和值(以及选项)时，设置cookie
 */
define([ 'jquery' ], function($) {
  return function(name, value, options) {
    if (typeof value != 'undefined') { // name and value given, set cookie
      options = options || {};
      if (value === null) {
        value = '';
        options.expires = -1;
      }
      var expires = '';
      if (options.expires) {
        var date;
        if (options.expires.toUTCString) {
          date = options.expires;
        } else if (typeof options.expires == 'number') {
          date = new Date();
          date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
        }
        if (date) {
          expires = '; expires=' + date.toUTCString();
        }
        // use expires attribute, max-age is not supported by IE
      }
      var path = options.path ? '; path=' + options.path : '';
      var domain = options.domain ? '; domain=' + options.domain : '';
      var secure = options.secure ? '; secure' : '';
      document.cookie = [ name, '=', encodeURIComponent(value), expires, path, domain, secure ].join('');
    } else { // only name given, get cookie
      var cookieValue = null;
      if (document.cookie && document.cookie != '') {
        var cookies = document.cookie.split(';');
        for (var i = 0; i < cookies.length; i++) {
          var cookie = jQuery.trim(cookies[i]);
          // Does this cookie string begin with the name we want?
          if (cookie.substring(0, name.length + 1) == (name + '=')) {
            cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
            break;
          }
        }
      }
      return cookieValue;
    }
  };
});